I’m in the service industry and I rely on tips as my main source of income. Cash is my main form of payment and it works out pretty well for me. The only downside is that a wallet full of cash inevitably leads to a pocketful of coins. Coins are annoying. They jingle, they weigh more than paper money, and they are only worth fractions of a dollar. It’s very tempting to leave eight-nine cents at the cashier rather than be burdened with the excessive amount of change. But I’ve long ago realized that coins are still money and they add up quickly. So I lug home the random coins I’ve acquired throughout the day and throw them in a coin jar.

A coin jar is like a piggy bank for adults. The main difference between the two is that one is a jar and the other is shaped like a pig. You deposit coins in the jar and it gradually fills up. Then you take the coins to the bank and turn them into real money. The bigger the jar, the more money you get. It’s economics in action.